I was thinking about the oiling system for the SOHC and how the oil is pumped through the rocker shafts. Are the ends of the rocker shafts open or closed? I would figure that there would be a benefit to capping off the ends of the rocker shafts with machine set screws in order to allow oil pressure to build up in the shafts if they aren't. By having the rocker shafts open on the ends, excess oil just runs out the sides. Thoughts?